[49/92] ram: rk3399: Compute stride for 1 channel a
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Message ID 20190611145135.21399-50-jagan@amarulasolutions.com
State New
Headers show
Series
  • ram: rk3399: Add LPDDR4 support
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Commit Message

Jagan Teki June 11, 2019, 2:50 p.m. UTC
Add stride computation for the sdram which support
single channel a

This configuration available in NanoPi NEO4 and the
same can work with existing rk3399-sdram-ddr3-1866.dtsi

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
---
 drivers/ram/rockchip/sdram_rk3399.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch
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diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 5985c37f08..033b2730a6 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -1214,6 +1214,10 @@  static unsigned char calculate_stride(struct rk3399_sdram_params *sdram_params)
 		chinfo |= 1 << channel;
 	}
 
+	/* stride calculation for 1 channel */
+	if (sdram_params->base.num_channels == 1 && chinfo & 1)
+		return 0x17;	/* channel a */
+
 	/* stride calculation for 2 channels, default gstride type is 256B */
 	if (ch_cap[0] == ch_cap[1]) {
 		cap = ch_cap[0] + ch_cap[1];